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UNITED STATES PATENT OFFICE.

IVALTER E. PARK, OF BROOKLYN, ASSIGNOR TO THE AMERICAN PNEU- MATIO TOOL COMPANY, OF NEWV YORK, N. Y.

CALKlNG-BIT.

SPECIFICATION forming part of Letters Patent No. 435,077, dated August 26, 1890.

Application filed June 26, 1890. Serial No. 856,895. No model.)

To all whom it may concern:

Be it known that I, WALTER E. PARK, a citizen of the United States, residing at Brooklyn,in the county of Kings and State of New York, have invented certain new and useful Improvements in Oalking-Bits, of which the following is a specification.

My invention relates to an improvement in calking-bits, and is designed particularly for use in connection with the pneumatic tool shown and described in Letters Patent No. 412,517, issued October 8, 1889.

The object of my invention is to provide the bit with a guide-finger, whereby it may be utilized for calking certain classes of work heretofore impossible to do with pneumatic tool and ordinary bit, owing to the fact that in the work referred to there is insufficient bearing-surface for the working-face of the bit to enable the latter to be held in place by reason of the extremely-rapid vibration of the tool.

Theinventiou consists, broadly, in a call;- ing-bit provided with a guide-finger for holding and steadying the workingface of the bit upon the sheet being calked.

The invention further consists in the detailed construction of bit hereinafter fully described and claimed.

In the drawings, Figure 1 is an elevation showing the calking-bit fitted to a pneumatic tool and illustrating the bit adapted to work on the seam of the water-leg of a boiler. Figs. 2, 3, 4, and 5 illustrate bits having different forms of calking-faces.

Referring to the drawings, A represents the pneumatic tool, B the spindle, and O the calking-bit. This bit is provided at its upper end calking-bit O, and formed integral therewith, is a guidefinger E. This guide-finger E is provided with a curved portiona and with a slightly-rounded bearing portion 1), which has the projecting extension 0, which when the bit is in position on the sheet extends slightly outward from the latter and allows the call;- ing-face to be moved on the sheet against which it rests. The sheets a: of the waterleg are connected by the ring y and rivet z, and the curved portion of the calking-bit is provided, so that the guide-finger may escape said rivet-head and rest on the sheet. By providing this guide-finger it will be apparent that the calking-face of the bit may be steadied and held in place on the edge of the sheet and moved freely upon said edge by reason of the rounded portion.

Having thus fully described my invention,

what I claim as new, and desire to secure by Letters Patent, is-

1. A calking-bit provided at its lower end with a projecting guide-finger, substantially as set forth.

2. A calking-bit provided at its lower end with a projecting guide-finger having a rounded portion, as set forth.

3. A calking-bit provided at its lower end with a projecting guide-finger having the rounded and curved portion, substantially as set forth.

4. A calking-bit provided at its lower en with a projecting guide-finger having the curved portion a, as set forth.

5. A calking-bit provided at its lower end with a projecting guide-finger having the curved portion a, the rounded portion 1), and the projecting extension 0, as set forth.

WALTER E. PARK.

Witnesses:

Boer. F. MULLINS, FREDERICK S. WAIT. 

